T O P I C R E V I E W |
jonas |
Posted - Apr 15 2010 : 10:00:38 AM Hi,
i saw your circuit for the led vu meter.
my question is the following: you wrote, it is designed for 1V input. But I want to use this circuit after a Booster stompbox, which gives an output signal of about 9V. Is it enough to change the R4 with a TrimPoti, to scale the input voltage?
thanks, jonas. |
2 L A T E S T R E P L I E S (Newest First) |
jonas |
Posted - Apr 17 2010 : 03:10:36 AM okay ... i see
thanks. |
audioguru |
Posted - Apr 15 2010 : 10:16:59 PM R4 is not a volume control. The circuit as shown works poorly with a max input of only 1.25V. It is shown on the datasheet of the LM3915 with a max input of 10V. A resistor is added between pin 7, pin 8 and ground so that the pin 7 reference voltage is higher but it must be at least 1.5V less than the power supply voltage. |
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